Question

我有一个包含名称字段和已批准字段的表。但是，多个条目可以具有相同的名称。我一直在尝试编写一个查找所有唯一名称的查询，并决定它是否没有批准的条目

我觉得我需要使用连接，但我只能真正加入它。有没有这样做的功能，我只是没有找到？或者我是否需要使用一些奇怪的联接来完成这项工作。

Answer 1

define variable isApproved as logical no-undo.

for each customer no-lock break by name:

  if first-of( name ) then isApproved = no.

  if approved then isApproved = yes.

  if last-of( name ) and isApproved = no then display name.

end.

Answer 2

大约6个月前，我的问题与你的完全一样。我使用过这样的解决方案。希望它有所帮助。

DEF TEMP-TABLE tt-name NO-UNDO
    FIELD name      AS CHAR
    FIELD approved  AS LOG
    INDEX ch-unique IS PRIMARY UNIQUE
        name.

/* Create a list of unique customers */
FOR EACH customer FIELDS(name) NO-LOCK:

    IF NOT CAN-FIND(FIRST tt-name 
                    WHERE tt-name.name = customer.name) THEN DO:

        CREATE tt-name.
        ASSIGN tt-name.name = customer.name.

    END.

END.

/* Look for at least one customer who matches name and not approved */
FOR EACH tt-name:

    IF CAN-FIND(FIRST customer NO-LOCK
                WHERE customer.name = tt-name.name 
                AND   NOT customer.approved) THEN
        ASSIGN tt-name.approved = NO.
    ELSE
        ASSIGN tt-name.approved = YES.

END.

/* Display the results */
FOR EACH tt-name
    WHERE NOT tt-name.approved:
    DISP tt-name WITH WIDTH 333 NO-ERROR.
END.

选择所有名称条目均未获批准的名称

2 个答案: